Patents Examined by C. W. Bonner
  • Composite of refractory material
    Patent number: 5330942
    Abstract: A composite refractory material composition comprises a boron carbide matrix and minor constituents of yttrium-boron-oxygen-carbon phases uniformly distributed throughout the boron carbide matrix.
    Type: Grant
    Filed: January 22, 1993
    Date of Patent: July 19, 1994
    Assignee: Martin Marietta Energy Systems, Inc.
    Inventors: Cressie E. Holcombe, Marvin S. Morrow